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Old 06-29-2011, 06:29 PM
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3/4 or 1/2 copper line for HVLP supply

Did some searching so sorry if I missed a thread like this.

I built a temporary paint booth in my garage and I have a 80 gallon 2 stage Sanborn compressor. Tomorrow im getting 1/2 air fittings for my Devilbiss Finishline 3 HVLP spray gun. I have not seen bigger and assuming for the best CFM/air supply at the gun ill need the biggest line I can fit.

Since 1/2 fittings for the spray gun are the largest that I have seen or even make sense, Should I just plumb my garage with 1/2 copper pipe??

Will it do me any good to use 3/4 in copper piping up to my Devilbiss QC3 dryer/filter then use 1/2'' air hose??

Im doing a rear quarter panel on a 92 Miata as a practice car then if it turns out good ill most likely paint my 92 bronco.

What do you think?? Thanks!

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Old 06-29-2011, 08:59 PM
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I used approximately 50 feet of 1/2" copper line for my system. The primer gun is a FLlll and the BC/CC gun an Iwata LPH400. I have a smaller compressor and not a bit of problem with quantity or quality. Save the extra bucks 1/2" vs 3/4" for another quart (pint?) of paint, especially if this is only for a temporary system. That paint job - my AVATAR car - before final polish:

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Old 06-29-2011, 09:22 PM
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I was never a fan of yellow until now that is some amazing looking work. I will take your advice, 1/2" it is. Thank you very much. What brand if paint did you go with?
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Old 06-29-2011, 09:37 PM
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Quote:
Originally Posted by Mach1460
I was never a fan of yellow until now that is some amazing looking work. I will take your advice, 1/2" it is. Thank you very much. What brand if paint did you go with?
The car is painted with DuPont ChromaBase and cleared with SPI universal. The color "flops" depending on the light as it is '06 up Shelby/GT Mustang Venetian Orange. Outside in the sun, orange. Fluorescents, yellow.

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Old 06-29-2011, 09:47 PM
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I see more orange now in your avitar when comparing to the pic you posted. Very cool
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Old 08-01-2011, 07:51 PM
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Quote:
Originally Posted by Mach1460
Did some searching so sorry if I missed a thread like this.

I built a temporary paint booth in my garage and I have a 80 gallon 2 stage Sanborn compressor. Tomorrow im getting 1/2 air fittings for my Devilbiss Finishline 3 HVLP spray gun. I have not seen bigger and assuming for the best CFM/air supply at the gun ill need the biggest line I can fit.

Since 1/2 fittings for the spray gun are the largest that I have seen or even make sense, Should I just plumb my garage with 1/2 copper pipe??
Rule of Thumb: 3/4" for runs (sloped upwards); 1/2" for drops. Drops go up, over, then down to inhibit water and debris from the drop.

The 3/4" pipe lowers your air velocity which keeps you from pushing water and debris past the traps and into the gun (which is why an air hose directly from the compressor - even with a trap/filter - blows water out the gun).
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Old 08-01-2011, 09:36 PM
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1/2" copper will be plenty sufficient for a 1 man garage.
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Old 08-02-2011, 08:48 AM
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The longer the run the more restrictive it is. For a short run, 1/2 will do if no major tools are run. For larger shops it will slow the tools down. I have 2 shops about 30 ft apart with a compressor in the back shop plumbed into the front with 3/8 as it was handy and I only power a lift with it. Using 3/8 hoses as we all do is no problem but with 3/8 line over the distance noted, in the front the tools spool up for about 10 seconds then are useless.
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